spl: nand: simple: replace readb() with chip specific read_buf()

Some NAND controllers define custom functions to read data out,
respect this in order to correctly support bad block handling in
simple SPL NAND framework.

NAND controller specific read_buf() is used even to read 1 byte in
case of connected 8-bit NAND device, it turns out that read_byte()
may become outdated.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Tom Warren <twarren@nvidia.com>
Acked-by: Scott Wood <scottwood@freescale.com>

diff --git a/drivers/mtd/nand/nand_spl_simple.c b/drivers/mtd/nand/nand_spl_simple.c
index 700ca32..e69f662 100644 (file)
--- a/drivers/mtd/nand/nand_spl_simple.c
+++ b/drivers/mtd/nand/nand_spl_simple.c
@@ -115,6 +115,7 @@ static int nand_command(int block, int page, uint32_t offs,
 static int nand_is_bad_block(int block)
 {
        struct nand_chip *this = mtd.priv;
+       u_char bb_data[2];
 
        nand_command(block, 0, CONFIG_SYS_NAND_BAD_BLOCK_POS,
                NAND_CMD_READOOB);
@@ -123,10 +124,12 @@ static int nand_is_bad_block(int block)
         * Read one byte (or two if it's a 16 bit chip).
         */
        if (this->options & NAND_BUSWIDTH_16) {
-               if (readw(this->IO_ADDR_R) != 0xffff)
+               this->read_buf(&mtd, bb_data, 2);
+               if (bb_data[0] != 0xff || bb_data[1] != 0xff)
                        return 1;
        } else {
-               if (readb(this->IO_ADDR_R) != 0xff)
+               this->read_buf(&mtd, bb_data, 1);
+               if (bb_data[0] != 0xff)
                        return 1;
        }